How to spell SIGHEXD correctly?

The correct spelling for "sighexd" could be "sighed" or "sighed XD". "Sighed" is the past tense of "sigh", meaning to exhale audibly in a way that shows one's sadness, tiredness or relief. "XD" is an online abbreviation that represents a happy or laughing face with crinkled eyes and a wide-open mouth.